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When2DoWhat

Optimize your schedule based on chronobiology research

Chronotype reflects how your internal clock and sleep drive align to shape your daily rhythm of energy and fatigue. It can be measured reliably by the morningness-eveningness questionnaire (MEQ), first described by Horne & Ostberg, 1976.

How It Works

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1. Choose Your Chronotype

Select whether you're naturally a morning person, night owl, or somewhere in between. Take the MEQ test for accurate results!

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2. Get Optimized Schedule

Receive personalized schedule suggestions that align task types with your peak performance times based on chronobiology research.

What's Your Chronotype?

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Morning Type/Lark

Morning chronotype individuals, also known as early chronotypes or larks, prefer to be active in the morning and sleep and wake early.

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Intermediate Type

The intermediate chronotype are those who are somewhere in between, neither morning type nor evening type. Most people (60%) are this type.

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Evening Type/Owl

Evening chronotypes, also called late chronotypes or owls, prefer to be active in the evening and sleep and wake up late.

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Personal Optimal Time Windows

Visualize your peak performance times for different types of work based on your chronotype

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24-Hour Timeline

See your entire day at a glance with color-coded optimal windows for each task type

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Task Type Windows

Discover when to schedule analytic work, decision-making, creative tasks, and more

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Chronotype-Based

Personalized to your specific chronotype: morning lark, intermediate, or evening owl

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Research-Based

Based on peer-reviewed chronobiology research about cognitive performance patterns

Based on chronobiology research: Our scheduling algorithm uses peer-reviewed research on circadian rhythms and cognitive performance to optimize your task timing.